My period is 17 days late. Am I pregnant? When do I have to check using a pregnancy test?

Periods can stop/be late for a lot of reasons, like stress or weight loss.

But if you’ve had unprotected sex at all, you should definitely do a pregnancy test, because it is likely that you’re pregnant.

Even if you had protected sex, I suggest taking a pregnancy test just in case, because it is possible that something went wrong, like there being a hole in the condom or user error when putting it on causing sperm to be on the outside of the condom.